Oase BioMaster Filter Foam - (20ppi Blue / 30ppi Orange)
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Replacement sponge for Biomaster filter
Suitable for Biomaster 250, 350, 600, 850
30ppi has finer pores as compare to 20ppi
Customize your choice of filter foams to meet the needs of your aquarium
Timing to replace the filter foam varies upon aquarium size and the number of fish and plants